Assistant superintendent Steve Morgan said a student at Yeokum Middle School found the bullet on Monday and reported it to a teacher. The bullet was turned over to a school resource officer and police searched the building. No gun was ever found.

Morgan said teachers and administrative staff were made aware of the incident.

Parents said they are frustrated that the district wasn't more forthcoming with them about it. Parents said they started learning about the incident from Facebook posts and had to put the story together by talking among themselves.

"This is a bullet that went to a gun," said one parent who asked not to be identified so that her daughter wouldn't suffer repercussions. "Whether or not the gun was found doesn't make a difference. They usually go together."

The parent said she should have been notified Sunday night.

"We didn't need a phone call seconds from it happening, but we should have been told Monday night," she said.

Superintendent Ron Underwood said that the district was taking the situation seriously, especially in the wake of the Sandy Hook Elementary School shootings last December,

"We're losing kids in one of the safest places on Earth, which is a school," Underwood said. "That's nothing to play with. We have to err on the side of caution when it comes to children, especially my children."

District leaders said it's unclear how the bullet got there, whether it was left deliberately or fell out of someone's pocket. They said it's a very serious matter either way, which is why they called police to make sure there wasn't a gun on campus.

BELTON PARENTS FRUSTRATED WITH THE DISTRICT TONIGHT. SPECIFICALLY WITH HOW OFFICIALS HANDLED A SITUATION INVOLVING A BULLET FOUND IN A CLASSROOM. A STUDENT FOUND IT AT YOKUM MIDDLE SCHOOL ON MONDAY. KMBC NINE'S DIANE CHO IS LIVE WITH THE LATEST. PARENTS SAY TALKS OF THE SITUATION SPREAD LIKE WILDFIRE ON FACEBOOK - AND THEY SLOWLY STARTED PIECING TOGETHER WHAT HAPPENED BY TALKING TO EACH OTHER LAST NIGHT - NOT THE SCHOOL DISTRICT - THAT WAS UNTIL TODAY. NATS: CLIP 13: 14.30 THIS IS A SERIOUS MATTER AND IT SHOULD BE TAKEN SERIOUSLY THIS FORMER TEACHER - ASKED US NOT TO IDENTIFY HER BECAUSE SHE DIDN'T WANT HER DAUGHTER THROWN INTO THE SPOTLIGHT AT SCHOOL - BUT SHE WANTED TO MAKE IT LOUD AND CLEAR THAT SHE WASN'T HAPPY WITH THE BELTON SCHOOL DISTRICT AND HOW THEY HANDLED THE MATTER. 14.33 THIS IS A BULLET THAT WENT TO A GUN WHETHER OR NOT THE GUN WAS FOUND DOESN'T MAKE A DIFFERENCE USUALLY THEY GO TOGETHER DISTRICT OFFICIALS - NOTIFIED PARENTS TODAY THAT A FEMALE STUDENT FOUND THE BULLET IN A CLASSROOM AT YEOKUM MIDDLE SCHOOL ON MONDAY. THEY SAY THE GIRL HAD NO IDEA WHAT IT WAS - AND TURNED IT OVER TO A STAFF MEMBER AT THE SCHOOL - BUT IT APPEARED TO BE A BULLET BELONGING TO A HANDGUN. 4.37 THAT'S UNACCEPTABLE 11.16 - 11.28 WE'RE LOSING KIDS IN ONE OF THE SAFEST PLACES ON THIS EARTH WHICH IS IN SCHOOLS AND THAT'S NOTHING TO PLAY WITH WE HAVE TO ERR ON THE SIDE OF CAUTION WHEN IT COMES TO CHILDREN ESPECIALLY WHEN IT COMES TO MY CHILDREN THE PROBLEM MANY PARENTS HAVE WITH THE ISSUE NOW - IS THAT THEY'RE 2 DAYS TOO LATE. 3.32 I WAS TICKED OFF BC I SHOULDVE BEEN TOLD MONDAY NIGHT WE DIDN'T NEED A PHONE CALL SECONDS FROM IT HAPPENING BUT WE SHOULDVE BEEN TOLD MONDAY NIGHT WE CAUGHT UP WITH SUPERINTENDENT - DR. ANDREW UNDERWOOD TO FIND OUT WHAT HAPPENED - HE ADMITTED IT WAS A MISTAKE. SOT" 21.02 THE RESPONSBILITY TO PARENTS FALLS DIRECTLY ON MY SHOULDERS, WE COULDVE DONE A BETTER JOB AND WE DID NOT SO I HAVE TO TAKE RESPONSIBILITY FOR THAT WE'RE TOLD SEVERAL PARENTS ARE EXPECTED TO ATTEND TOMORROW NIGHT'S SCHOOL BOARD MEETING HOPING TO GET ANSWERS ABOUT WHAT HAPPENED IN THIS SITUATION. DISTRICT OFFICIALS SAY IT'S STILL UNCLEAR EXACTLY HOW THE BULLET GOT THERE -- AND WHETHER IT WAS LEFT THERE INTENTIONALLY OR FELL OUT OF SOMEONE'S POCKET. EITHER WAY THEY SAY IT'S A VERY SERIOUS MATTER. AND

The Obama administration will unveil a major climate change plan Monday aimed at a large reduction in greenhouse gas emissions from the nation's coal-burning power plants, a senior administration official told CNN.